Measuring the drug use of the residents of a city has always been difficult. In the past, current drug use was estimated from questionnaire responses, but due to the social stigma associated with drug use, a large amount of response bias was known to be present. A proposed method for measuring a city's current drug is to measure the amount of drugs detected in the inflow to the city's wastewater treatment facility. This method was used to compare the Marijuana usage, through the measurement of the active ingredient THC-COOH, of London versus Milan over a 3 week period. Samples were made at randomly chosen times throughout the day for 21 consecutive days in both cities. Units are mg/day/1,000 people. Based on previous data, the THC-COOH values are known to follow a normal distribution.

Match the assumption/condition on the left to the correct description on the right.

Group of answer choices

Independent Groups Condition

[ Choose ] 21 is less than 10% of all days water could have been sampled. The times the water were sampled were randomly selected for each city. The data come from two separate and independent (as far as waste water is concerned) cities. The THC-COOH values follow a normal distribution.

Randomization Condition

[ Choose ] 21 is less than 10% of all days water could have been sampled. The times the water were sampled were randomly selected for each city. The data come from two separate and independent (as far as waste water is concerned) cities. The THC-COOH values follow a normal distribution.

Nearly Normal Condition